pkeller pkeller

21-09-2018
Mathematics

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What is the exact area of triangle with measures a=6 b=7 and cos C= 1/4

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grujan50 grujan50

21-09-2018

The area of the triangle is A= (1/2)absinγ

(sinγ)Λ2+(cosγ)Λ2=1 => sinγ=√1-(cosγ)∧2= √1- (1/4)∧2=√1-(1/16)=√(15/16)=√15/4

A=(1/2)*6*7*√15/4=21*√15/4=(21/4)√15

Good luck!!!

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